QUESTIONS
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1. What type of image do x-rays form?
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2. What radiation is used in PET scans?
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3. What is ionising radiation?
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4. Give two examples of ionising radiation using in medicine.
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5. State the equation for calculating the intensity of radiation.
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6. State 2 types of non-ionising radiation used in medicine?
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7. Label the diagram of the eye below
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8. What controls the amount of light entering the eye?
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9. What distance is your far point when focussing?
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10. Why does an image get blurred when it is nearer that 25cm to your eye?
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11. What is the job of the ciliary muscle
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12. Where does the image focus in a person who is short sighted?
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13. A person who is long sighted struggles to focus what objects?
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14. What lens shape is needed to correct short sightedness?
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15. What lens shape is needed to correct long sightedness?
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16. How does a converging lens change the path of a light ray?
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17. State methods other than glasses that can be used to correct vision problems.
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18. How can you permanently correct a person’s vision? Explain how it works.
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19. What is the point at which converging rays meet called?
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20. What are the main causes of short sightedness?
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21. Define the term focal length.
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22. Where is the focal point in a diverging lens
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23. How is the power of a lens measured?
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24. What unit is used to measure the power of a lens.
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25. What is the lens equation?
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26. What factors are linked in the lens equation?
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27. Define a ‘real image’.
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28. Define a ‘virtual image’.
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29. State the law of reflection
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30. What is the ‘normal’?
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31. What is the definition of critical angle?
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32. Give three feature that help to maintain efficient diffusion in the lungs? Explain how each affects the rate. (6 marks)
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33. How Automatic windscreen wipers work?
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34. What happens to the speed of a wave in denser materials?
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35. When a ray passes into a material where is can move faster does it refract towards or away from the normal?
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36. In Snell’s law what to nr and ni stand for?
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37. Why is a light ray in an optical fibre always reflected back?
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38. What is an endoscope and how does it work?
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39. State 3 ways ultrasound can be used in either diagnosis and treatment
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40. State the 3 main parts of an x-ray machine.
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41. If you increase the potential difference in the machine how does it affect the x-rays?
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42. What is Thermionic emission
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43. Complete the blanks below
Increase temperature = _____________the electrons emitted = ____________ the X-rays produced.
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44. What is inverse square law?
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45. State 2 uses of fluoroscopes
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46. How does a CAT scan work?
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47. Give 2 benefits and 2 risks of X-rays, Fluoroscopes and CAT scans.
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48. How does a pacemaker work?
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49. Define the term action potential.
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50. What 2 things can a pulse oximeter tell us?
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